Radar dot (4)
I believe the answer is:
blip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">radar dot</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blip that I've seen before include "Glitch" , "Minor shock or interruption" , "Temporary lapse" , "Momentary deviation" , "Minor (and temporary) deviation from trend" .)